The author indicates at the beginning of the passage that ______.A．few writers did research on the subject of dreamB．previous researchers were short of observations and material related to dreamC．little progress was achieved on the nature of dreamD．educated public hold a better understanding of dream

单项选择题

In spite of thousands of years of endeavor, little progress has been made in the scientific understanding of dreams. This fact has been so universally acknowledged by previous writers on the subject that it seems hardly necessary to quote individual opinions. The reader will find, in many stimulating observations, and plenty of interesting material related to our subject, but little or nothing that concerns the true nature of the dream, or that solves definitely any of its enigmas. The educated layman, of course, knows even less of the matter.
The conception of the dream that was held in prehistoric ages by primitive peoples, and the influence which it may have exerted on the formation of their conceptions of the universe, and of the soul, is a theme of such great interest that it is only with reluctance that I refrain from dealing with it in these pages. I will refer the reader to the well-known works of Sir John Lubbock (Lord Avebury), Herbert Spencer, E. B. Tylor and other writers; I will only add that we shall not realize the importance of these problems and speculations until we have completed the task of dream interpretation that lies before us.
A reminiscence(回想，回忆) of the concept of the dream that was held in primitive times seems to underlie the evaluation of the dream which was current among the peoples of classical antiquity. They took it for granted that dreams were related to the world of the supernatural beings in whom they believed, and that they brought inspirations from the gods and demons. Moreover, it appeared to them that dreams must serve a special purpose in respect of the dreamer; that, as a rule, they predicted the future. The extraordinary variations in the content of dreams, and in the impressions which they produced on the dreamer, made it, of course, very difficult to formulate a coherent conception of them, and necessitated manifold differentiations and group-formations, according to value and reliability. The valuation of dreams by the individual philosophers of antiquity naturally depended on the importance which they were prepared to attribute to manticism in general.
In the two works of Aristotle in which there is mention of dreams; they are already regarded as constituting a problem of psychology. We are told that dream is not god-sent, that it is not of divine but of demonic origin. For nature is really demonic, not divine; that is to say, the dream is not a supernatural revelation, but is subject to the laws of the human spirit, which has, of course, a kinship with the divine. The dream is defined as the psychic activity of the sleeper, as he is asleep. Aristotle was acquainted with some of the characteristics of the dream-life; for example, he knew that a dream converts the slight sensations perceived in sleep, into intense sensations ("one imagines that one is walking through fire, and feels hot, if this or that part of the body becomes only quite slightly warm"), which led him to conclude that dreams might easily betray to the physician the first indications of an incipient physical change which escaped observation during the day.

The author indicates at the beginning of the passage that ______.

A．few writers did research on the subject of dream
B．previous researchers were short of observations and material related to dream
C．little progress was achieved on the nature of dream
D．educated public hold a better understanding of dream